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Article
Using multigroup-multiphase latent state-trait models to study treatment-induced changes in intra-individual state variability: An application to smokers' affect
Frontiers in Psychology: Quantitative Psychology and Measurement
  • Christian Geiser, Utah State University
  • Daniel Griffin, Utah State University
  • Saul Shiffman, University of Pittsburgh
Document Type
Article
Publisher
Frontiers
Publication Date
7-22-2016
DOI
10.3389/fpsyg.2016.01043
Abstract

Sometimes, researchers are interested in whether an intervention, experimental manipulation, or other treatment causes changes in intra-individual state variability. The authors show how multigroup-multiphase latent state-trait (MG-MP-LST) models can be used to examine treatment effects with regard to both mean differences and differences in state variability. The approach is illustrated based on a randomized controlled trial in which N = 338 smokers were randomly assigned to nicotine replacement therapy (NRT) vs. placebo prior to quitting smoking. We found that post quitting, smokers in both the NRT and placebo group had significantly reduced intra-individual affect state variability with respect to the affect items calm and content relative to the pre-quitting phase. This reduction in state variability did not differ between the NRT and placebo groups, indicating that quitting smoking may lead to a stabilization of individuals' affect states regardless of whether or not individuals receive NRT.

Citation Information
Christian Geiser, Daniel Griffin and Saul Shiffman. "Using multigroup-multiphase latent state-trait models to study treatment-induced changes in intra-individual state variability: An application to smokers' affect" Frontiers in Psychology: Quantitative Psychology and Measurement Vol. 7 (2016)
Available at: http://works.bepress.com/christian-geiser/33/